html.overlay-open,html.overlay-open body {
	height: 100%;
	overflow: hidden;
}

#overlay-container,.overlay-modal-background,.overlay-element {
	height: 100%;
	left: 0;
	position: absolute;
	top: 0;
	width: 100%;
	z-index: 500;
}

.overlay-modal-background {
	/* Using a transparent png renders faster than using opacity */
	background: transparent url(images/background.png) repeat;
}

.overlay-element {
	background: transparent;
	left: -200%;
	z-index: 501;
}

.overlay-element.overlay-active {
	left: 0;
}

html.overlay-open .displace-top,html.overlay-open .displace-bottom {
	z-index: 600;
}

/**
 * Within the overlay parent, the message about disabling the overlay is for
 * screen-reader users only. It is always kept invisible with the
 * element-invisible class, and removed from the tab order. Overlay-child.css
 * contains styling for the same message appearing within the overlay, and
 * intended for sighted users.
 */
#overlay-disable-message {
	display: none;
}

html.overlay-open #overlay-disable-message {
	display: block;
}